Barbara Fojkar (Avtor), Domen Leštan (Avtor)

Povzetek

The treatment of sewage sludge (SS) is one of the biggest challenges due to its large output and contamination with toxic metals (TMs). SS is also a potential resource for P, a strategic macronutrient in agriculture. The feasibility of integrated removal of TMs from SS by chelation and washing with ethylenediaminetetraacetate (EDTA) and SS solids reduction by aerobic digestion in bioreactors was investigated. In three consecutive SS treatment batches, an average of 70, 40 and 59% of Zn, Cu and Pb were removed. Cr was not chelated and remained in the SS. EDTA persisted during the aerobic digestion of SS and was efficiently recycled (82% on average) in the pH gradient 12.5 - 2 (ReSoil® method) and reused in the next batch. The reduction of SS solids (on average 18.4% in 6 days) was more efficient with EDTA than with the control treatment (7.4%). The integrated process also increased the concentration of plant-available P in the washed SS by an average of 1.6-fold compared to the control. EDTA induced fragmentation of SS. This resulted in a loss of SS dry matter (on average 26.1%) and total P (on average 24.6%). The novel integrated process efficiently removed TMs that chelate with EDTA, is scalable and should be compatible with current processes in wastewater treatment plants.

Ključne besede

sewage sludge;toxic metals;phosphorus;ethylenediaminetetraacetate;aerobic digestion;ReSoil®;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UL BF - Biotehniška fakulteta
UDK: 628.3:502.175
COBISS: 227243523 Povezava se bo odprla v novem oknu
ISSN: 0959-6526
Št. ogledov: 99
Št. prenosov: 1726
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Slovenski jezik
Sekundarne ključne besede: blato komunalnih čistilnih naprav;potencialno strupene kovine;toksične snovi;fosfor;aerobna obdelava;aerobna razgradnja;EDTA;
Vrsta dela (COBISS): Članek v reviji
Strani: 9 str.
Letnik: ǂVol. ǂ495
Zvezek: ǂissue ǂ1, [article no.] 145047
Čas izdaje: Mar. 2025
DOI: 10.1016/j.jclepro.2025.145047
ID: 25968310